located in conduit for occipital bone medulla oblongata foramen magnum Design pattern notes: check whether this fits the foramen design pattern GAID:228 TAO:0002045 FMA:75306 ZFA:0005387 AAO:0010826 NCIT:C12495 SCTID:244679008 Wikipedia:Foramen_magnum MESH:D005539 In anatomy, in the occipital bone, the foramen magnum is one of the several oval or circular apertures in the base of the skull, through which the medulla oblongata (an extension of the spinal cord) enters and exits the skull vault. Apart from the transmission of the medulla oblongata and its membranes, the foramen magnum transmits the Spinal Accessory nerve, vertebral arteries, the anterior and posterior spinal arteries, the membrana tectoria and alar ligaments. [WP,unvetted]. foramen of skull